Kobashi Soji has a bitter past because he is bigger than others. When he goes to college, he decides to start a new life in a place where he doesn't know anyone or have any connections.

Rent 39,840yen! Close to station and university!

This is the "Sand Dune Hazoso", a very cheap on-balance apartment run by a beautiful landlord named Natsuko, who is a strange old woman.

"Well then, now that you've had a look around, let's go through the ...... tenant screening process." "Oh, Mr. Landlord, why are you taking your clothes off?"

As it is, in the name of the tenant screening process, I'm graduating as a virgin, and furthermore, I've been told by Nadeko that all of the residents in this apartment... Soushi is told that he is a failed succubus with his own problems.

In exchange for renting the room at a very low price, I want you to support them so that they can become great succubus. I'll use that big, fine dick of yours to ...... anytime, anywhere, 24/7."

Thus, the new sexual life of him and the fallen Succubus begins.